Porphyritic textures suggest a complex cooling and crystallization history. one that includes at least two rates of crystallization.

Name: Porphyritic textures suggest a complex cooling and crystallization history. one that includes at least two rates of crystallization.
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Porphyritic textures in igneous rocks indicate that the rock experienced two distinct cooling rates: slow cooling that forms larger crystals (phenocrysts) followed by rapid cooling that forms a finer-grained matrix.

Porphyritic Textures Suggest a Complex Cooling and Crystallization History